"The Nevada Attorney General's office is preparing the appropriate complaint for the State of the Nevada," Aguilar said. He didn't reveal Siver's exact hCG level or what kind of punishment he might receive.

Most commonly known as a female fertility drug, hCG is typically used by steroid users in an effort to restart their testosterone production following steroid usage.

The UFC 168 drug tests results were delayed because both Siver and Siyar Bahadurzada's "A" samples came back inconclusive. As a result, both of their "B" samples were tested and only Siver's came back positive. The other 21 fighters on the card passed their drug tests.

MMAFighting.com contacted Siver two weeks ago for a comment on his inconclusive test, but the German fighter did not respond.

Former MLB star Manny Ramirez most famously tested positive for hCG in 2009 and was subsequently suspended for 50 games. For more on hCG's presence in sports, click here.